Stoker



Mann- 30 1926.y

R. B. MILDON sToKER Fild oct. .27, 1920 2 sheets-sheet 1 I. fr!

March 30,1926.

R. B. MILDON ls'roxER Filed Oct. 27,

1920 2 sheets-sheet 2 :EEE:

man a u E m ummm-EEE u am E as um mamma R5. Mila/0N' INVENTOR AvroRNEY 'Patented Mar. 3o, 192e.

UNITED STATES BEGINALD B. HILDON, 0F LANSDQWNE,

HOUSE ELECTRIC AND IANUFACTURING COMPANY, A

S'YIN'NIL -I sroxna. Y'

PENNSYLVANIA, ASSIGNOB AYT0 WESTING- .Application led October 27, 1920. Serial No. 420,015.

To all wliom z't may concern.'

Be it known that I, REGINALD B.'M1LDoN, a citizen of the United States, and.a resident of 20 W. Baltimore Ave., Lansdowne,

in thev county of Delaware and` State of Pennsylvania, have invented a new and use.- ful Improvement in Stokers, of which the following is a specication. v

My invention relates to mechanical stokers, particularly of the underfee'd type, and it has for its object to provide apparatus of the character designated which shall .beeffective in producin uniform fuel distribu tion throughout a re"- box and whichv shall further be of relativelysmall overall height, thus adapting the structure for installation in fire boxes havinfr low boiler settings, as, for exam le, those tdesigned for' hand firing.

A further object of my invention is to provide a compact underfeedstoker struc ture which may be readily applied to and withdrawn from a furnace.

In the accompanying drawings, Fig. 41

is a vertical sectional view of the Stoker mechanism embodyng my invention; Fig. 2 is a vew, partially in section and partially in elevation of the structure shown in Fin'. 1, being taken on the plane IIII thereof; and Fig. 3 is a plan view lof the apparatus shown in Fig. l.

In the. production of mechanical stokers, it has been proposed to supply the fuel to a main retort, forcing it therethrough by fuel pushers and to then pass the fuel on to branch retorts opening directly from the main retort, auxiliary pushing Ameans also being employed in the `branch retorts in order tokeep the fuel mass in motion.

With this construction, difficulties may be encountered in causing a smooth and undisturbed passage Qf the fuel from the main to the branch retorts, together with other difficulties to be hereinafter more fully set forth. l v

In accordance with my invention, I propose to provide a main retort having smooth and unbroken side 'walls throughout its length, and I suppl* fuel thereto in the usual manner by a nel pusher Aor ram so designed as to raise the fuel at the same time that it is forced longitudinally of the main retort. l

Auxiliary retorts are disposed beyond the barriers or Side walls lof the main retort and these auxiliary retorts are further prefer ably provided with fuel-moving means so CORPORATION 0F PENN- arranged as to maintain motion of the fuel bedaway from the main retort.

By this construction, a uniform and conf tinuous ow of the fuel to all portions of the fuel bed, together with eiiicientv combustion thereof isl maintained.

The entire structure thus set forth is pref! a1though,'obviously, the stoker structure op-l crates with equal effectiveness if permanently mounted. y

.Referring to the drawing for a 4more detailed understanding of my invention, Il, Vshow a main retort at 5 in Figs. l and 3,-

formed by side Walls or barriers G-Sand a bottom plate 7. This main retortextends inwardly from a fuel hopper 8, shown .in

dotted lines in Fig. 1Y and in full linesinI Fig. 3, and fuel is moved from the hopper 8 into the retort 5 b 'a vram 9 having a somewhat sharply inc ined rear face so as to 1 exert a lifting action on the fuel at the same time that it is forced backwardly.

AOne or more auxiliary rams 10 are mount ed inthe bottom of the retort 5 to slide upon the bottom. plate 7, these auxiliary rams being provided with driving lugs 11 projecting through slots in the plate 7 and lbeing connected to Van operating rod 12 for actuan ing ofthe auxiliary rams. 'Certain of the Working faces of these auxiliary rams lare so inclined so as to exert a lifting actionupon the fuel.

The side walls 6 are preferably formed by a seriesy of vtuyre sections 13,-as clearly shown in Fig. 2, and the tuyre openings l13 in these tuyresections are in communi1 vcation with an air chamber or. Awind b ox 14 formed below the Stoker, as' is usual practice.

retbqrts comprising side tuyre boxes 21-21 and a bottomportion made up Aof a fuely plate y are formed 'on each side of the mam retortV 5, each of these 22 and a ram member 23 mounted to recipro* cate thereupon. The auxiliary retorts 20--20 discharge upon ash plates 24-24 of any desired form. The auxiliary retorts`2G-20 and the tuyre boxes 21--21 are arranged alternately thel width of the furnace, and areterminated at their inner ends by the tuyresections 13*1 3, the latter constitut- -ing the continuous side walls 6--6 of they.

main retort 5. The retorts 20-20, the tuyre boxes 21-21 and. the sections 13-13 r are each preferably made uniform in size so the main retort, a though, by providing sufficient fuel-actuating means, the bottoms of-thevauxiliary retorts may be level, or even havey a slight upward slope away from the main retort. The ypusher members 28,

are provided with two orV more fuel-engaging members 2.5--25 and are furthermore designed to be actuated by `a variable' throw linkage mechanism 26, 27 connected to a.

rod'28, coupled in turn to the stoker drivil means which also drives the connecting r 12 to thevariable stroke fuel pushers 10 in the main retort 5. The outer surfaces or backs of the tuyre sections 13 at the inner ends 'of the auxiliar retorts 20--20 are given a smooth and gra ual slope, as shown at 29, this slope merging into the bottoms of the auxiliary` retorts 20-20.

The entire stoker structure thus set `forth is shown asmounted on wheels 30--30 th low boiler settings with. which my running on tracks 31-31 so that the entire structure may loe-readily withdrawn for inspection or repair, th1s feature4 being of particular importance in, connection with Stoker is adapted to be employed, the space over the Stoker frequently beings: too small for ready inspection and re air in situ. Particular attention is directe vto this feature as the com lete Stoker with rits small overallheight, its light yetgrugged construction, its eiiective fuel distributionand its ready removability ada 't it`for 'use in many installations where the installation oft mechanical stokers has. hitherto been deemed unfeasible.

Havin thus described the arrangement of a vsto er mechanism embodying my invvention, the operation thereof is as follows Upon starting the drivingb mechanism, the main ram 9 and the auxiliary rams 23--23 are reciprocated throu l1 strokes determined by the quality oV 'fuel andthe de- -sired rateofcombustion. Coal introduced into the hopper 8 passes into the main retort 5 and combustion is initiated by means of air iowing from the tuyre sections 13. As the fuel mass is moved backward, it is also raisedfby the rams 9 and 10 and lifted over the side walls or barriers 6 6, falling' combination with a main retort havingyc iinto the upper ends of the auxiliary retorts where its travel is kept up by means of the l use of fuel pushers nsurin supply in' al the pitch given to the bottoms of the auxauxiliary rams-23'-23. lt should be noted that the fuel travel thus set forth is relatively smooth and free from obstruction there being no corners or other xed members inv the path of the fuel such as would tend to cause Jamming and clogging there of. The smooth and unbroken side walls 6 6 permit the ready passage of fuel there alongV and thereover and combustion greatly aided by the copious supply of an' which may be supplied through these side walls, this copious air supply further'aid- 4ing in that it maintains the side walls at relatively' low temperatures and, therefore, retards thedestruction thereof.

'The fuel overflowing from the main re`` is -relied upon but little, if at'all, or the forward motion of the fuel, the extensive uniform fuel parts of the 're box. Thus iliary retorts may be very slight and it re sults that the vertical thickness ofthe entire Stoker structure is relatively small, thus permitting the Stoker to be installed in many fire boxes designed for hand. firing and which are not adapted for many types 'of underfgeed stokers because of inadequate- ,height I Y Furthermore, the' specific structure shown. prevents'the formation of a high fuel crown and this factor also permits the installation of this apparatus in re boxes of relatively low head room.

While l have shown my invention in but one form, it will beobvious to those skilled in the art that it is not so limited but is susce tible of vvarious other -changes andlio 1. ln an underfeed .Stoker structure, the 'l i tinuous side walls and provided with fileli 4feeding means, of a plurality of auxiliary retorts -Separated from said main retort by said side walls and arranged to receive fuel fromv said main retort. i

43. In *an underfeed Stoker structure,f the combination with a main retort having continuous Side walls and provided with fuelfeeding means, of a plurality of auxiliary retorts separated from said main retort by said side walls and arranged to'receive fuel from said main retort, each of said auxiliary retorts being provided with fuel-moving means.

4'. In an underfeed Stoker structure, the combination with a main retort having continuous side walls, provided with air inlet openings throughout Substantiallykthe entire length thereof, of auxiliary retorts disposed beyond said side walls and arranged to receive fuel from Said main retort.

5. In an underfeed Stoker structure, .the

combination with amain retort having con-k 4 tinuous side walls provided with air inlet openings throughout substantially the entire length thereof, and provided with fuel-feeding means, of a plurality of .auxiliary retorts .separated from said main retort by said side walls and arranged to receive fuel from said main retort. v

6. In an underfeed Stoker structure, the combination with a main retort having continuous side walls provided with air inlet openings throughout substantially the entire length thereof and fuel-feeding means for said main retort, of a plurality of auxiliary retorts separated from said main retort by y said side walls: and arranged to receive fuell from said main retort, each of said auxiliary retorts being provided with fuel-moving 7. In an underfeed Stoker structure,the combination with a. primary retort for the initial coking and combustion of4 fuel, of a .secondary retort arranged tov .receive fuel from the primary retort for completing said combustion, said retorts being Separated-by a barrier over which the fuel is' forced to pass, said secondaryretort having its axis at substantially a right angle to-the axis yof the main retort.

combination with a primary retort for the .initial coking and combustion of fuel, of.a. secondary retort arrangedv to rece1ve fuel from the primary vretort for completing said 9.' An underfeed Stoker comprising a main l .fuel-feeding device, a main retort to receive the fuel having tuyre sections forming Acontinuous side walls therefor, auxiliary retorts arranged at the side of the main retort to receive fuel therefrom, and means for lifting the fuel out ofthe main retort and distributing it to the auxiliary retorts.

)10. An underfeed Stoker comprising a main fuel-feeding mechanism, a main retort to receive the fuel having tuyre sections formingA continuous side walls therefor, aux iliary retorts at the Side of the main retort and arranged toreceive fuel therefrom, fuel pushers in the main` and auxiliary retorts,

and adjustable means associated with the fuelpushers for regulating the distribution of `fuel in the main and auxiliary retorts.

11.' An lunderfeed Stoker comprising a main fuel-feedin mechanism, a mainfretort to receive the ranged at the side of the main retort to r'eceive fuel therefrom, the main retort includin tuyre members forming a continuous si e wall for the main retort and inner end walls for the yauxiliary retorts.

12.A n underfeed Stoker comprising Aa mainl retort havin fcontinuous side walls, means forfeeding uel into the main'n'etort',

means for causing a .forward and lifting' movement of the el inthe main retort, a grate Section (disposed contiguousto lone of said Side walls andadapted to receive fuel from the main retort, said grate section comuel, auxiliary retorts arprising alternate. auxiliary retorts and tuyre sections. .l v v 13. In an underfeed Stoker, the combination with a main retort having continuous side walls, of a lfurnace floor adapted to receive fuel overflowing from the main retort, said floor comprising alternately disposed vauxiliary retorts and tuyre sections.

14. In an underfeed Stoker, the combination -witlia main retort havin continuous side walls, of a furnacefloor a apted to receive fuel overiowing from thel main retort, said floor comprisi-n auxiliary retorts an tortand fuel feeding vmeans associated with the several auxiliary retorts.

15. In anunderfeedftoken the combination with a main -ret'ortkhavin continuous sidewalls, of a furnace floor a apted to rel alternately: disposedtuyre4 section, fuel feeding means associated with said main -re 10o i y ceive lfuel overflowing from the main retort, f

said furnace floor'comprising 'a plurality" of air' delivery tuyre sectionsextending transversely from the main retort, and' imper` forate fuel supporting'sections disposed between adjacent tuyre sections.

In testimony whereof, I have hereunto, i'

subscribed my ber, 1920.

Y l REGINALD B. MILDO'N. 5

name this22nd day of Octo- 

